CN103487214A - Nitrogen-charge pressure-maintaining leakage detecting device and method for refrigerating system - Google Patents
Nitrogen-charge pressure-maintaining leakage detecting device and method for refrigerating system Download PDFInfo
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- CN103487214A CN103487214A CN201310455044.9A CN201310455044A CN103487214A CN 103487214 A CN103487214 A CN 103487214A CN 201310455044 A CN201310455044 A CN 201310455044A CN 103487214 A CN103487214 A CN 103487214A
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Abstract
The invention relates to a nitrogen-charge pressure-maintaining leakage detecting device and method for a refrigerating system. The pressure-maintaining leakage detecting method comprises the steps that nitrogen in a pipeline of the refrigerating system is charged into another refrigeration system to be detected for leakage through a nitrogen recovery pipeline after pressure maintaining of the refrigerating system is finished; when the pressure-maintaining pressure value of the refrigerating system to be detected for leakage cannot meet the set requirement, high-pressure nitrogen is charged into the refrigerating system to be detected for leakage through an inflating pipeline; the nitrogen is stopped being charged into the refrigerating system to be detected for leakage until the pressure of the refrigerating system to be detected for leakage meets the set pressure-maintaining pressure value; pressure maintaining is carried out on the refrigerating system to be detected for leakage. The pressure-maintaining leakage detecting method enables nitrogen of the refrigerating system having been detected for leakage to be directly charged into the next refrigerating system to be detected for leakage, so that recycling of the nitrogen after pressure-maintaining leakage detection is achieved, nitrogen waste is avoided, and the work efficiency is improved.
Description
Technical field
The present invention relates to the refrigeration system technical field, be specifically related to a kind of refrigeration system and fill nitrogen pressurize leakage detection apparatus and method.
Background technology
In the production run of refrigeration system, must carry out Leak Detection, to guarantee its quality, because the temperature of liquid nitrogen is low, produce easily, and cost is low, pollution-free, therefore, a lot of enterprises are in the production run of refrigeration system, all to adopt to fill nitrogen pressurize leak detecting refrigeration system is hunted leak, after leak detection finishes directly by nitrogen discharge in surrounding air, do not recycled, produce tens machines every day, cause a large amount of nitrogen wastes, and nitrogen directly is emitted on around production line, although nitrogen itself is very little to the harm of human body, but when concentration raises, cause in air oxygen concentration to drop to 19.5% when following, can form the environment of anoxic, produce smothering action, likely cause personal injury.Therefore, in the leak detection process of refrigeration system, must be recycled the nitrogen of discharge, be improved the utilization factor of nitrogen, be avoided the wasting of resources.
In one piece of Patent Application Publication that application number is 201310088681.7, leak hunting method while disclosing a kind of big-and-middle-sized air conditioning for automobiles production, at first the method fills high pressure nitrogen, use is filled the helium retracting device piping of big-and-middle-sized air conditioning for automobiles product is filled with to nitrogen, make the air pressure in piping reach 2400～2600KPa, dwell time > 6s, carry out detecting leakage; Then fill the helium nitrogen mixture gas after vacuumizing, filled air pressure is 750～850KPa; And then carry out helium mass spectrum leak detection, use helium mass spectrometer leak detector to carry out the helium mass spectrum to product and check micro-leakage; Finally reclaim the helium nitrogen mixture gas, utilize the helium nitrogen mixture gas filled in helium retracting device recovery product piping, leak detection finishes.When the helium nitrogen mixture gas is reclaimed, at first put the recovery flexible pipe on the piping interface of air conditioning for automobiles product, then utilize the described helium retracting device that fills to reclaim the helium nitrogen mixture gas in air conditioning for automobiles product piping, until the air pressure in described piping is 100KPa, finally pull down the recovery flexible pipe on air conditioning for automobiles product piping interface.
Although the leak hunting method in above-mentioned Patent Application Publication has finished gas is reclaimed rear in leak detection, but whole process is comparatively complicated, after each air-conditioning pressurize leak detection finishes, all to once reclaim gas, then when detecting next air-conditioning system, again the nitrogen of recovery is filled with to next air-conditioning system, inefficiency, system cost is higher.
Summary of the invention
The purpose of this invention is to provide a kind of refrigeration system and fill nitrogen pressurize leakage detection apparatus and method, can the nitrogen of discharge after pressurize leak detection in the refrigeration system production run be reclaimed, improve the nitrogen recycling utilization factor, and simple in structure, cost is low, solve in existing refrigeration system production run, because nitrogen after pressurize arbitrarily discharges and causes significant wastage, and the ineffective problem of leak detection process.
For achieving the above object, the solution of the present invention is: a kind ofly for refrigeration system, fill nitrogen pressurize leak hunting method, step is as follows:
(1) by asepwirator pump, the nitrogen completed in the refrigeration system of leak detection is discharged to refrigeration system to be checked, refrigeration system to be checked is carried out to supercharging;
(2), when the pressure in the refrigeration system that completes leak detection is lower than 0.1MPa, asepwirator pump quits work;
(3) if the force value now in refrigeration system to be checked do not reach setting fill nitrogen dwell pressure value, in refrigeration system to be checked, be filled with high pressure nitrogen, until the force value of refrigeration system to be checked reach setting fill nitrogen dwell pressure value after, stop being filled with high pressure nitrogen, refrigeration system to be checked is carried out to pressurize.
Before starting asepwirator pump, at first by the refrigeration system that completes leak detection, discharge nitrogen to refrigeration system to be checked voluntarily, when the pressure of two refrigeration systems reaches balance, restart asepwirator pump.
The present invention also provides a kind of refrigeration system to fill nitrogen pressurize leakage detection apparatus, comprise nitrogen recycling pipeline for reclaiming nitrogen and for supplement the loading line of high pressure nitrogen to refrigeration system to be checked, be provided with charging valve and high pressure nitrogen storage tank on described loading line, the air intake opening of described charging valve is communicated with described high pressure nitrogen storage tank by pipeline, its gas outlet is for being communicated with refrigeration system to be checked, the nitrogen recycling pipeline comprises the air-discharging and supercharging pipeline that is used to refrigeration system to be checked discharge nitrogen supercharging and for controlling the control device of air-discharging and supercharging pipeline break-make, be provided with asepwirator pump and non-return valve on described air-discharging and supercharging pipeline, the bleeding point of described asepwirator pump is used for by flexible pipe and examines refrigeration system compressor and be communicated with, its exhausr port is communicated with the on the suction side of described non-return valve, the outlet side of non-return valve is used for being communicated with refrigeration system to be checked by boost electromagnetic valve,
Described control device is electrically connected to described boost electromagnetic valve and asepwirator pump respectively, for the break-make of controlling boost electromagnetic valve and the start and stop of asepwirator pump.
This device also is provided with gas exhaust piping, on described gas exhaust piping, is provided with drain tap, and the air intake opening of described drain tap is used for by pipeline and examines refrigeration system compressor and be communicated with, its gas outlet by described boost electromagnetic valve for being communicated with refrigeration system to be checked.
Described control device is a pressure switch, and the normally opened contact of described pressure switch, with after described boost electromagnetic valve is connected in series, is connected to the two ends of power supply; Its normally closed contact, with after the starting switch of described asepwirator pump is connected in series, is connected to the two ends of described power supply.
Described drain tap and charging valve are manually-operated gate.
The beneficial effect that the present invention reaches: the present invention is when carrying out the pressurize leak detection to refrigeration system, nitrogen is reclaimed, avoided the waste of nitrogen, and this device is that nitrogen directly has been discharged in refrigeration system next to be hunted leak, the refrigeration system to be hunted leak to the next one carried out supercharging, when nitrogen is reclaimed, next refrigeration system is filled to the nitrogen pressurize, saved the time, make process simpler, increase work efficiency, and this apparatus structure is simple, easy to operate, reduced cost.
The accompanying drawing explanation
Fig. 1 is that refrigeration system of the present invention is filled nitrogen pressurize leakage detection apparatus schematic diagram;
Fig. 2 is control device schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Refrigeration system of the present invention is filled nitrogen pressurize leakage detection apparatus embodiment:
Refrigeration system of the present invention fills that nitrogen pressurize leakage detection apparatus comprises nitrogen recycling pipeline for reclaiming nitrogen and for supplement the loading line of high pressure nitrogen to refrigeration system to be checked, be provided with charging valve and high pressure nitrogen storage tank on described loading line, the air intake opening of described charging valve is communicated with described high pressure nitrogen storage tank by pipeline, and its gas outlet is for being communicated with refrigeration system to be checked; The nitrogen recycling pipeline comprises the air-discharging and supercharging pipeline that is used to refrigeration system to be checked discharge nitrogen supercharging and for controlling the control device of air-discharging and supercharging pipeline break-make, be provided with asepwirator pump and non-return valve on described air-discharging and supercharging pipeline, the bleeding point of described asepwirator pump is used for by flexible pipe and examines refrigeration system compressor and be communicated with, its exhausr port is communicated with the on the suction side of described non-return valve, and the outlet side of non-return valve is used for being communicated with refrigeration system to be checked by boost electromagnetic valve; Described control device is electrically connected to described boost electromagnetic valve and asepwirator pump respectively, for the break-make of controlling boost electromagnetic valve and the start and stop of asepwirator pump.
As shown in Figure 1, the direction of arrow represents the flow direction of nitrogen, the refrigeration system that refrigeration system to be checked to be hunted leak, examine refrigeration system and completed the refrigeration system of leak detection, the present embodiment also is provided with gas exhaust piping, be provided with drain tap on described gas exhaust piping, the air intake opening of described drain tap is used for by pipeline and examines refrigeration system compressor and be communicated with, its gas outlet is used for being communicated with refrigeration system to be checked by described boost electromagnetic valve, drain tap and the charging valve of the present embodiment are manually-operated gate, control device can be configured to a pressure switch, this pressure switch is controlled the break-make of pressure piping and gas exhaust piping by the break-make of controlling asepwirator pump and boost electromagnetic valve, completed on the pipeline be connected between the refrigeration system of leak detection and refrigeration system to be checked and leakage detection apparatus and be provided with a tensimeter, pressure in the refrigeration system piping that is respectively used to test refrigeration system to be checked and completed leak detection.
As shown in Figure 2, in the present embodiment, the normally opened contact of pressure switch KA is with after boost electromagnetic valve is connected in series, be connected to the two ends of power supply, its normally closed contact is with after asepwirator pump is connected in series, be connected to the two ends of power supply, when the piping pressure of refrigeration system does not reach preset pressure, pressure switch is failure to actuate, its normally opened contact keeps the state of opening, normally closed contact is kept closed, boost electromagnetic valve is the dead electricity conducting state, asepwirator pump is also in "on" position, if now open drain tap, gas exhaust piping is connected, nitrogen can flow to from the refrigeration system that completes leak detection refrigeration system to be checked, if open the asepwirator pump starting switch, asepwirator pump work, the nitrogen completed in the refrigeration system of leaking hunting can be by pressure piping discharged to refrigeration system to be checked.When if the pressure in the refrigeration system piping reaches preset pressure, pressure switch action, its normally opened contact closure, normally closed contact can disconnect, and boost electromagnetic valve can obtain electric disconnection so, and asepwirator pump also can cut off the power supply.
The specific works process is as follows:
This is filled to nitrogen pressurize leakage detection apparatus is connected between the refrigeration system that completes leak detection and refrigeration system next to be hunted leak by flexible pipe, fasten charging valve, open drain tap, now boost electromagnetic valve is the dead electricity on-state, the nitrogen completed in the refrigeration system of leak detection discharges in refrigeration system to be checked, when two refrigeration systems reach balance, close drain tap, starting asepwirator pump switch, at this moment asepwirator pump is drawn nitrogen and is discharged to refrigeration system to be checked from the refrigeration system that completes leak detection, refrigeration system to be checked is carried out to supercharging, along with the nitrogen in the refrigeration system that completes leak detection reduces gradually, its pressure also reduces gradually, when the pressure of the refrigeration system that completes leak detection during lower than 0.1MPa, the pressure switch action, its normally opened contact closure, normally closed contact disconnects, boost electromagnetic valve obtains electric disconnection, pressure piping is in off-state, air-breathing supercharge pump outage, quit work.At this moment, if what refrigeration system force value to be checked did not reach setting fills nitrogen dwell pressure value, open charging valve, be filled with high pressure nitrogen to refrigeration system to be checked, after reaching the setting requirement, close charging valve, refrigeration system to be checked is carried out to pressurize, simultaneously, pull down and be connected to two refrigeration systems and fill the flexible pipe between nitrogen pressurize leakage detection apparatus.
The principle of work of asepwirator pump belongs to those skilled in the art's common practise, in the refrigeration system pipeline, is filled with the technology of knowing that nitrogen also belongs to those skilled in the art, does not repeat them here.
Refrigeration system of the present invention is filled nitrogen pressurize leak hunting method embodiment:
Step is as follows:
(1) will fill nitrogen pressurize leakage detection apparatus and be connected with the refrigeration system that completes leak detection with refrigeration system to be checked by flexible pipe respectively, by asepwirator pump, the nitrogen completed in the refrigeration system of leak detection be discharged to refrigeration system to be checked, refrigeration system to be checked will be carried out to supercharging;
(2), when the pressure in the refrigeration system that completes leak detection is lower than 0.1MPa, asepwirator pump quits work;
(3) if the force value now in refrigeration system to be checked do not reach setting fill nitrogen dwell pressure value, in refrigeration system to be checked, be filled with high pressure nitrogen, until the force value of refrigeration system to be checked reach setting fill nitrogen dwell pressure value after, stop being filled with high pressure nitrogen, refrigeration system to be checked is carried out to pressurize.
The concrete steps of filling nitrogen pressurize leak hunting method of the present embodiment are as follows:
(1) by the pressurize leakage detection apparatus in above-mentioned pressurize leakage detection apparatus embodiment by flexible pipe with refrigeration system to be checked with examined refrigeration system and be communicated with;
(2) open the drain tap on gas exhaust piping, the nitrogen completed in the refrigeration system of leak detection flows to refrigeration system to be checked by gas exhaust piping;
(3), when the pressure of two refrigeration systems reaches balance, gas exhaust piping disconnects, asepwirator pump work, and pressure piping is connected, and refrigeration system to be checked is carried out to supercharging;
(4) when the pressure in the refrigeration system that completes leak detection is lower than 0.1MPa, pressure piping disconnects, and asepwirator pump quits work;
(5) if now the nitrogen dwell pressure value of filling of refrigeration system to be checked does not reach setting value, open charging valve, be filled with high pressure nitrogen by loading line to refrigeration system to be checked, until after the force value of filling the nitrogen pressurize of refrigeration system to be checked reaches setting value, close charging valve, refrigeration system to be checked is carried out to pressurize, and pull down and be connected to the flexible pipe filled on nitrogen pressurize leakage detection apparatus.In the present embodiment, the dwell pressure value is set as 3.0Mpa, and filling the nitrogen dwell time is 0.5 hour.
The specific implementation process of filling nitrogen pressurize leak hunting method of the present embodiment is same as the previously described embodiments, the principle of work of asepwirator pump belongs to those skilled in the art's common practise, be filled with the technology of knowing that nitrogen also belongs to those skilled in the art in the refrigeration system pipeline, all repeat no more at this.
The present invention is when carrying out the pressurize leak detection to refrigeration system, nitrogen is reclaimed, avoided the waste of nitrogen, and this device is that nitrogen directly has been discharged in refrigeration system next to be hunted leak, when nitrogen is reclaimed, next refrigeration system is filled to the nitrogen pressurize, saved the time, make process simpler, increase work efficiency.
Claims (6)
1. a refrigeration system is filled nitrogen pressurize leak hunting method, it is characterized in that, step is as follows:
(1) will fill nitrogen pressurize leakage detection apparatus and be connected with the refrigeration system that completes leak detection with refrigeration system to be checked by flexible pipe respectively, by asepwirator pump, the nitrogen completed in the refrigeration system of leak detection be discharged to refrigeration system to be checked, refrigeration system to be checked will be carried out to supercharging;
(2), when the pressure in the refrigeration system that completes leak detection is lower than 0.1MPa, asepwirator pump quits work;
(3) if the force value now in refrigeration system to be checked do not reach setting fill nitrogen dwell pressure value, in refrigeration system to be checked, be filled with high pressure nitrogen, until the force value of refrigeration system to be checked reach setting fill nitrogen dwell pressure value after, stop being filled with high pressure nitrogen, refrigeration system to be checked is carried out to pressurize.
2. the nitrogen pressurize leak hunting method that fills according to claim 1, it is characterized in that, before starting asepwirator pump, at first by the refrigeration system that completes leak detection, discharge nitrogen to refrigeration system to be checked voluntarily, when the pressure of two refrigeration systems reaches balance, restart asepwirator pump.
3. one kind adopts the refrigeration system of the described method of claim 1 to fill nitrogen pressurize leakage detection apparatus, comprise nitrogen recycling pipeline for reclaiming nitrogen and for supplement the loading line of high pressure nitrogen to refrigeration system to be checked, be provided with charging valve and high pressure nitrogen storage tank on described loading line, the air intake opening of described charging valve is communicated with described high pressure nitrogen storage tank by pipeline, its gas outlet is for being communicated with refrigeration system to be checked, it is characterized in that
The nitrogen recycling pipeline comprises the pressure piping that is used to refrigeration system to be checked discharge nitrogen supercharging and for controlling the control device of pressure piping break-make, be provided with asepwirator pump and non-return valve on described pressure piping, the bleeding point of described asepwirator pump is used for by flexible pipe and examines refrigeration system compressor and be communicated with, its exhausr port is communicated with the on the suction side of described non-return valve, and the outlet side of non-return valve is used for being communicated with refrigeration system to be checked by boost electromagnetic valve;
Described control device is electrically connected to described boost electromagnetic valve and asepwirator pump respectively, for the break-make of controlling boost electromagnetic valve and the start and stop of asepwirator pump.
4. refrigeration system according to claim 3 is filled nitrogen pressurize leakage detection apparatus, it is characterized in that, this device also is provided with gas exhaust piping, be provided with drain tap on described gas exhaust piping, the air intake opening of described drain tap is used for by pipeline and examines refrigeration system compressor and be communicated with, its gas outlet by described boost electromagnetic valve for being communicated with refrigeration system to be checked.
5. refrigeration system according to claim 3 is filled nitrogen pressurize leakage detection apparatus, it is characterized in that, described control device is a pressure switch, and the normally opened contact of described pressure switch, with after described boost electromagnetic valve is connected in series, is connected to the two ends of power supply; Its normally closed contact, with after the starting switch of described asepwirator pump is connected in series, is connected to the two ends of described power supply.
6. refrigeration system according to claim 4 is filled nitrogen pressurize leakage detection apparatus, it is characterized in that, described drain tap and charging valve are manually-operated gate.
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| CN104075106A (en) * | 2014-06-24 | 2014-10-01 | 江苏天舒电器有限公司 | Control method and control device of nitrogen filling and pressure maintaining vacuumizing device |
| CN105674047A (en) * | 2016-03-02 | 2016-06-15 | 王海涛 | Intelligent nitrogen inflating and supplementing device and nitrogen inflating and supplementing method |
| CN105759862A (en) * | 2016-03-03 | 2016-07-13 | 北京卫星环境工程研究所 | Pressure control method for automatic air discharge process of satellite small-volume high-pressure pipeline system |
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| CN104075106A (en) * | 2014-06-24 | 2014-10-01 | 江苏天舒电器有限公司 | Control method and control device of nitrogen filling and pressure maintaining vacuumizing device |
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| CN110058184A (en) * | 2018-01-19 | 2019-07-26 | 北京绪水互联科技有限公司 | Cold head efficiency calculation index and method, the system that cold head efficiency calculation and monitoring are realized using the index |
| CN110058184B (en) * | 2018-01-19 | 2021-06-08 | 北京绪水互联科技有限公司 | Method for calculating cold head efficiency, and method and system for monitoring cold head efficiency |
| WO2023021606A1 (en) * | 2021-08-18 | 2023-02-23 | 三菱電機株式会社 | Airtightness testing device and airtightness testing method |
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